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Base Case
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The 2022 Stock Assessment, considered the Base Case OM
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2022 Stock Assessment
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MOM_000
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Reference
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Span the key plausible uncertainties in natural mortality (M) and steepness of the Beverton Holt stock recruit relationship (h)
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Same as Base Case with 3 levels of M (0.1, 0.2, 0.3) and 2 levels of h (0.75, 0.9)
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MOM_133, MOM_134, MOM_135, MOM_139, MOM_140, MOM_141
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R1. Lower Steepness
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Evaluate sensitivity to stock with low resilence
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Same as Base Case with 3 levels of M (0.1, 0.2, 0.3) and 1 level of h (0.6)
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MOM_127, MOM_128, MOM_129
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R2. Higher sigmaR
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Evaluate sensitivity to higher variability in recruitment process error
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Same as Reference, with higher recruitment variability
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MOM_136, MOM_137, MOM_138, MOM_142, MOM_143, MOM_144
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R3. Remove CAL
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Evaluate impact of only using indices of abundance in OM conditioning (i.e., don’t include catch at length data in the model fitting)
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Same as Reference, except OMs only conditioned on indices of abundance (not the catch-at-length data)
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MOM_151, MOM_152, MOM_153, MOM_157, MOM_158, MOM_159
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R4. Increase q
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Evaluate impact of an historical increase catchability that was not accounted for in the standardization of the indices of abundance
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Same as Reference, except an assumed 1 percent average annual increase in catchability during the historical period
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MOM_187, MOM_188, MOM_189, MOM_193, MOM_194, MOM_195
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R5. Increasing q
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Evaluate impact of catchability continuing to increase in projections
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Same as R4. Increase q, except the 1 percent average annual increase in catchability is assumed to continue in the projections
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MOM_187 (inc q in projections), MOM_188 (inc q in projections), MOM_189 (inc q in projections), MOM_193 (inc q in projections), MOM_194 (inc q in projections), MOM_195 (inc q in projections)
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R6. Implementation Error
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Evaluate impact of illegal, unreported, or unregulated catches
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Same a Reference, except a consistent unreported 10 percent overage in catch relative to TAC
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MOM_133_overage, MOM_134_overage, MOM_135_overage, MOM_139_overage, MOM_140_overage, MOM_141_overage
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R7. Climate Change Recruitment
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Evaluate impact of systematic pattern in recruitment deviations in projection periods; a proxy for impact of climate change on productivity
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Same as Reference, except recruitment deviations in projections have postive/negative trends
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MOM_133_Decreasing Trend, MOM_133_Increasing Trend, MOM_133_Increased Variability, MOM_134_Decreasing Trend, MOM_134_Increasing Trend, MOM_134_Increased Variability, MOM_135_Decreasing Trend, MOM_135_Increasing Trend, MOM_135_Increased Variability, MOM_139_Decreasing Trend, MOM_139_Increasing Trend, MOM_139_Increased Variability, MOM_140_Decreasing Trend, MOM_140_Increasing Trend, MOM_140_Increased Variability, MOM_141_Decreasing Trend, MOM_141_Increasing Trend, MOM_141_Increased Variability
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R8. Size Limit
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Evaluate impact of different size limits, including removing all size regulations
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Same as Reference, except size limit fixed to 120 cm or removed completely
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MOM_133 (modified size limit in CMP), MOM_134 (modified size limit in CMP), MOM_135 (modified size limit in CMP), MOM_139 (modified size limit in CMP), MOM_140 (modified size limit in CMP), MOM_141 (modified size limit in CMP)
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R9. Alternative Management Cycles
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Evaluate the impact of a longer management cycle
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Same as Reference, except the management cycle is modified from the default 3 years
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MOM_133 (modified in projections), MOM_134 (modified in projections), MOM_135 (modified in projections), MOM_139 (modified in projections), MOM_140 (modified in projections), MOM_141 (modified in projections)
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